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117 lines
2.3 KiB
NASM
117 lines
2.3 KiB
NASM
19 years ago
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#include "FreeRTOSConfig.h"
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portSAVE_CONTEXT macro
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push r4
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push r5
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push r6
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push r7
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push r8
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push r9
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push r10
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push r11
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push r12
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push r13
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push r14
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push r15
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mov.w &_usCriticalNesting, r14
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push r14
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mov.w &_pxCurrentTCB, r12
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mov.w r1, @r12
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endm
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/*-----------------------------------------------------------*/
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portRESTORE_CONTEXT macro
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mov.w &_pxCurrentTCB, r12
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mov.w @r12, r1
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pop r15
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mov.w r15, &_usCriticalNesting
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pop r15
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pop r14
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pop r13
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pop r12
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pop r11
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pop r10
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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pop r4
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reti
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endm
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/*-----------------------------------------------------------*/
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.CODE
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/*
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* The RTOS tick ISR.
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*
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* If the cooperative scheduler is in use this simply increments the tick
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* count.
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*
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* If the preemptive scheduler is in use a context switch can also occur.
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*/
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_vTickISR:
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portSAVE_CONTEXT
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call #_vTaskIncrementTick
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#if configUSE_PREEMPTION == 1
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call #_vTaskSwitchContext
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#endif
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Manual context switch called by the portYIELD() macro.
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*/
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_vPortYield::
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/* Mimic an interrupt by pushing the SR. */
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push SR
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/* Now the SR is stacked we can disable interrupts. */
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dint
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/* Save the context of the current task. */
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portSAVE_CONTEXT
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/* Switch to the highest priority task that is ready to run. */
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call #_vTaskSwitchContext
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/* Restore the context of the new task. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Start off the scheduler by initialising the RTOS tick timer, then restoring
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* the context of the first task.
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*/
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_xPortStartScheduler::
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/* Setup the hardware to generate the tick. Interrupts are disabled
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when this function is called. */
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call #_prvSetupTimerInterrupt
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/* Restore the context of the first task that is going to run. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/* Place the tick ISR in the correct vector. */
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.VECTORS
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.KEEP
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ORG TIMERA0_VECTOR
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DW _vTickISR
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END
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